Function for Layer Mask Reveal Selection?

Question

I'm making a script in which in the middle of it I need to apply a mask on the current selection, I'm not sure if I'm not knowing how to search for it but I just couldn't find an answer, so I thought I should ask it here. Is it possible to create a function that pretty much does the same as if I had an active selection and I applied a mask to it, using the button on the picture. Or to be more precise the Photoshop Keyboard Shortcuts on the Layer Mask Section calls it "Reveal Selection". So basically this:

So basically as in the images a function that would mask the selected area.

Stephen Marsh · Accepted Answer

Is this for the new UXP framework or legacy ExtendScript? If ES, you'll need to use Action Manager (AM) code, not DOM code:

maskSelection("revealSelection"); // "revealSelection" or "hideSelection"

function maskSelection(maskParameter) {
    var s2t = function (s) {
        return app.stringIDToTypeID(s);
    };
    var descriptor = new ActionDescriptor();
    var reference = new ActionReference();
    descriptor.putClass(s2t("new"), s2t("channel"));
    reference.putEnumerated(s2t("channel"), s2t("channel"), s2t("mask"));
    descriptor.putReference(s2t("at"), reference);
    descriptor.putEnumerated(s2t("using"), s2t("userMaskEnabled"), s2t(maskParameter));
    executeAction(s2t("make"), descriptor, DialogModes.NO);
}

Function for Layer Mask > Reveal Selection?

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